1. Swine influenza A (A/H1N1) infection in two children—Southern California, March–April 2009;Centers for Disease Control and Prevention (CDC);MMWR Morb Mortal Wkly Rep,2009
2. Antigenic and genetic characteristics of swine-origin 2009 A(A/H1N1) influenza viruses circulating in humans;Garten;Science,2009
3. Outbreak of swine-origin influenza A (A/H1N1) virus infection—Mexico, March–April 2009;Centers for Disease Control and Prevention (CDC);MMWR Morb Mortal Wkly Rep,2009
4. New influenza A (A/H1N1) virus: global epidemiological situation, June 2009;World Health Organization;Wkly Epidemiol Rec,2009
5. Critically ill patients with 2009 influenza A(A/H1N1) infection in Canada;Kumar;JAMA,2009